[Sneap] problem of ion source

[Gianluca Quarta]

Dear Cs Lee,

we also run the same type of source. I also suggest you to try a better
way of mixing the solution. We usually use the HVEE coating solution but
we mix it by a magnetic stirrer for 8-10 hours before using it.

Good luck,

Gianluca Quarta

-------
Dr. Gianluca QUARTA
Ricercatore, Assistant Professor
CEDAD, AMS Radiocarbon Dating and Ion Beam Analysis Facility
Department of Engineering of Innovation
University of Salento
Via per Monteroni, 73100, Lecce
ITALY
Ph. +39 0832 295050
Fax +39 0831 507408
e-mail: gianluca.quarta at unile.it
Web:www.gianluca.quarta.unile.it
Web: www.cedad.unile.it




Dear cslee
>
>
>
> I had similar sufferings as you describe in your email.  For us the
> resolution of the problem came as we discovered the correct way of mixing
> the solution.  We roll the bottle in a stone polisher in the horizontal
> position for 1 hour.  You can get one of those in hobby stores.
>
>
>
> I hope this helps.
>
> Regards
>
>
>
> Victor Rotberg
>
>
>
>
>
>
>
>   _____
>
> From: sneap-bounces at tunl.duke.edu [mailto:sneap-bounces at tunl.duke.edu] On
> Behalf Of cslee
> Sent: Monday, December 10, 2007 11:41 PM
> To: sneap at tunl.duke.edu
> Subject: [Sneap] problem of ion source
>
>
>
> Dear Friends:
>
>
>
> 18 years ago I started to use 358A ion source ( duplasmatron produced by
> general ionx, now the same type of ion souce is produced by high voltage
> engineering in europe neitherlanders).  Three four years ago  I had the
> exactly same experience as the manual statement, unfortunately recent
> three
> four years I have to try and "guess" a lot to make the ion source work.
> It
> does waste too much time.   The coating solution I used, except Cathode
> Coating T-33C-118 (Ba-Sr-Ca) CO3 56-31-13%., we aslo used the product from
> HV company (it only marked: A848001, B-6976 with a HV trade mark).
> According to the manual when we bake the filament with the coating, the
> voltage between the anode and intermediate anode (or electrode) is over 34
> volts.  Then there is enough thermal electrons to induce a stable
> discharge.
> Now the voltage we measured only less than 1 or 2 volts, and the the
> current
> we used is over 26 amperes.   This coating solution we just purchased last
> year, so there are some problems which we don't find it out yet.   If you
> know where is the problem,  please  informe me I'll appreciate that very
> much.  Otherwise you can provide me which university or comapny use the
> same
> types of coating and  ion source, I may  seek their help.
>
>
>
> Here I delievered to you the description about the coating procedure from
> the manual of the ion source .
>
>
>
> " wash" the filament back and forth in the coating to insure it flows
> through the gauze mesh.  Approximately 20 seconds is sufficient.    (quote
> from the accompanied files).
>
>
>
>  But now we need to work about two hours to coat the solution on the
> mesh."
> and it doesn't work at all.
>
>
>
>
>
> Best regards
>
>
>
>
>
> CS Lee
>
>
>
> email address: cslee at phy.ncu.edu.tw
>
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